| In the safety of vaccines, background incidence rates are key to allow proper monitoring and assessment. |
| Between 2003 and 2014, 148,947 new cases of nine autoimmune diseases were identified in seven European healthcare databases from four countries. |
| Incidence rates were highest for Bell’s palsy and lowest for Kawasaki disease. Specific patterns were observed by sex, age, calendar time, and data sources. |
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